I bought a 1991 525i and it overheats. We replaced the radiator , water pump , stat and continually burped it and stiil having heating problems. No smoke from the exhaust to suggest head gasket but the heater blows cold air even on heat. Help please. Thanks

Sounds like maybe a blockage in the system. You bleed it with the nose of the vehicle a foot or two higher than the rear, heater on full and car up to operating temp and still no heat at the heater core? Check the heater lines going into the firewall for any pinches or hard lumps (also feel for any coolant moving through them, be careful though. SHOULD be hot)

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Big Evil, The BMW driving monster of the American Southwest (Currently on BMW #5)